[bug 93853][merge] Better message about inability to place tags in empty branch

[James Westby]

On (30/07/07 15:59), John Arbash Meinel wrote:
> I think we would want to do:
> 
> revision_id = ensure_null(revision_id)
> if revision_id != _mod_revision.NULL_REVISION:
>     raise errors.***

Should that be an equality test? You want to raise an error for the
NULL_REVISION, right?

Thanks,

James

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